Gdb sessions without debuggin symbols: flowolf@shannara ~ $ gdb /usr/lib/openoffice/program/soffice.bin GNU gdb 6.5 Copyright (C) 2006 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i686-pc-linux-gnu"...(no debugging symbols found) Using host libthread_db library "/lib/libthread_db.so.1". (gdb) run Starting program: /usr/lib/openoffice/program/soffice.bin (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [Thread debugging using libthread_db enabled] [New Thread -1234700624 (LWP 15266)] [New Thread -1234834528 (LWP 15271)] [New Thread -1269122144 (LWP 15272)] [New Thread -1277650016 (LWP 15273)] [New Thread -1288836192 (LWP 15274)] [New Thread -1307313248 (LWP 15280)] [Thread -1307313248 (LWP 15280) exited] Program received signal SIGSEGV, Segmentation fault. [Switching to Thread -1234700624 (LWP 15266)] 0xb1886d46 in toupper_w () from /usr/lib/libnss_wins.so.2 (gdb) quit The program is running. Exit anyway? (y or n) y flowolf@shannara ~ $ gdb /usr/lib/mozilla-firefox/firefox-bin GNU gdb 6.5 Copyright (C) 2006 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i686-pc-linux-gnu"...(no debugging symbols found) Using host libthread_db library "/lib/libthread_db.so.1". (gdb) run Starting program: /usr/lib/mozilla-firefox/firefox-bin (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) (no debugging symbols found) [Thread debugging using libthread_db enabled] [New Thread -1220700496 (LWP 14766)] [New Thread -1222947936 (LWP 14772)] [New Thread -1241076832 (LWP 14773)] [New Thread -1254274144 (LWP 14774)] [New Thread -1268159584 (LWP 14776)] [New Thread -1276552288 (LWP 14777)] [Thread -1268159584 (LWP 14776) exited] Program received signal SIGSEGV, Segmentation fault. [Switching to Thread -1276552288 (LWP 14777)] 0xb35c8d46 in toupper_w () from /usr/lib/libnss_wins.so.2 (gdb) quit The program is running. Exit anyway? (y or n) y This is where libnss_wins.so came from: shannara ~ # equery b /usr/lib/libnss_wins.so.2 [ Searching for file(s) /usr/lib/libnss_wins.so.2 in *... ] net-fs/samba-3.0.23 (/usr/lib/libnss_wins.so.2 -> libnss_wins.so) And my emerge --info: shannara ~ # emerge --info Portage 2.1.1_pre2-r8 (default-linux/x86/2005.1, gcc-4.1.1/vanilla, glibc-2.4-r3, 2.6.16-gentoo-r10 i686) ================================================================= System Settings ================================================================= System uname: 2.6.16-gentoo-r10 i686 Intel(R) Celeron(R) M processor 1.50GHz Gentoo Base System version 1.12.1 app-admin/eselect-compiler: 2.0.0_rc2-r1 dev-lang/python: 2.4.3-r1 dev-python/pycrypto: 2.0.1-r5 dev-util/ccache: [Not Present] dev-util/confcache: [Not Present] sys-apps/sandbox: 1.2.18.1 sys-devel/autoconf: 2.13, 2.60 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2 sys-devel/binutils: 2.17 sys-devel/gcc-config: [Not Present] sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.11-r5 ACCEPT_KEYWORDS="x86 ~x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=pentium-m -pipe -fomit-frame-pointer" CHOST="i686-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/X11/xkb" CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/eselect/compiler /etc/gconf /etc/java-config/vms/ /etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c" CXXFLAGS="-O2 -march=pentium-m -pipe -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig distlocks metadata-transfer sandbox sfperms strict" GENTOO_MIRRORS="http://www.die.unipd.it/pub/Linux/distributions/gentoo-sources/ http://ftp.uni-erlangen.de/pub/mirrors/gentoo/" LANG="en_US.UTF-8" LC_ALL="en_US.UTF-8" LINGUAS="en it" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude='/distfiles' --exclude='/local' --exclude='/packages'" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/overlays/main" SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage" USE="x86 3ds 7zip X a52 aac aalib acpi alsa asf avahi avi berkdb bitmap-fonts bluetooth bogofilter bonjour bonobo boo bzip2 cairo cdinstall cdio cdparanoia cdr cdrom cegui cg cgi chm crypt cups curl daap dba dbus devil directfb djvu dri dts dvd dvdread eds effects encode expat fastcgi fbcon ffmpeg firefox flac foomaticdb gcj gd gdbm gif gimp glade glitz glut glx gmail gnome gphoto2 gpm gsl gstreamer gstreamer010 gtk gtk2 gtkhtml gvim hal howl httpd icq idn ilbc imlib inkjar input_devices_keyboard input_devices_mouse input_devices_synaptics ipod ipv6 irda jabber jack javascript joystick jpeg kdeenablefinal kdehiddenvisibility kqemu libg++ libwww lighttpd live lm_sensors lua mad matroska mbrola mikmod mmx mng mono mozilla moznocompose moznoirc moznomail mp3 mp4 mpeg mplayer musepack musicbrainz mysql mysqli nautilus ncurses nfs nls nodrm nptl nptlonly ntfs ode offensive ogg oggvorbis openal opengl pam pcmcia pcre pdf pdflib perl php plugin png pop postgres ppds python qemu-fast quicktime rar readline real reiserfs rtsp ruby samba scanner sdl session shout skins speex sql sqlite sqlite3 sse sse2 ssl stream subversion svg sysfs syslog tagwriting tcpd theora threads tiff truetype truetype-fonts type1-fonts udev unicode usb userlocales utf8 v4l v4l2 video_cards_i810 vorbis wifi win32codecs x264 xinerama xml xml2 xmlrpc xorg xv xvid zlib elibc_glibc input_devices_evdev kernel_linux linguas_en linguas_it lirc_devices_serial userland_GNU" Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LDFLAGS, PORTAGE_RSYNC_EXTRA_OPTS
I found a way to "disable" the bug: changing hosts: files dns wins mdns to hosts: files dns mdns in /etc/nsswitch.conf appears to be a workaround for the bug. I tried to recompile samba, glibc and firefox but the problem is still here, this is the only way I found to disable the crashes.
*** Bug 140996 has been marked as a duplicate of this bug. ***
This Ubuntu thread has a patch for the fix https://launchpad.net/distros/ubuntu/+source/samba/+bug/39990
Err, can you package.mask this badly broken stuff meanwhile?
samba-3.0.23 masked. There is also a problem in ldap filter calls... Staying tuned with upstream.
Created attachment 92325 [details, diff] samba-3.0.23-util_unistr.patch I've looked at the Ubuntu patch mentioned and there's a function in the samba's source, lazy_initialize_conv(). It's already called from within check_dos_char(). In original it looks like this: /* see if a ucs2 character can be mapped correctly to a dos character and mapped back to the same character in ucs2 */ int check_dos_char(smb_ucs2_t c) { lazy_initialize_conv(); /* Find the right byte, and right bit within the byte; return * 1 or 0 */ return (doschar_table[(c & 0xffff) / 8] & (1 << (c & 7))) != 0; } and the lazy function in question looks like this: void lazy_initialize_conv(void) { static int initialized = False; if (!initialized) { initialized = True; load_case_tables(); init_iconv(); } } So I guess it's more efficient to call lazy_initialize_conv() instead of load_case_tables() every time one of the offending functions gets called and uses uninitialized tables. This way load_case_tables() is used as well, but only when necessary. I've just added a required call to these functions, like this: /******************************************************************* Convert a wchar to upper case. ********************************************************************/ smb_ucs2_t toupper_w(smb_ucs2_t val) { lazy_initialize_conv(); return upcase_table[SVAL(&val,0)]; } Is this a good workaround for this bug?
Created attachment 92326 [details, diff] samba-3.0.23.ebuild.diff A diff against samba-3.0.23.ebuild from my overlay - for easier reference.
